What screen width adjustment does and when you need it

Screen width adjustment lets you change how much of your monitor's physical surface actually displays an image. Most monitors can show a smaller picture than their full size — useful when your display looks stretched, when text appears too large or too small, or when you're using an older video signal that doesn't fill the screen edge to edge.

This is different from changing your resolution or zoom level in Windows or macOS. Those change how many pixels your computer sends. Screen width adjustment changes how your monitor stretches or shrinks that signal across its panel. You'll need this when your image has black bars on the sides, when everything looks squashed horizontally, or when your monitor's edges show nothing but darkness.

The adjustment lives in your monitor's physical menu — the buttons on the back or bottom of the screen itself — not in your computer's settings. This matters because your computer can't always fix what the monitor is doing on its own.

Key Takeaways

  • Screen width is controlled by your monitor's physical menu buttons, not your computer, and is separate from resolution or zoom settings.
  • Most monitors have a menu button (often labeled Menu or with a gear icon) that opens an on-screen display where you'll find width or zoom controls.
  • Look for settings named Horizontal Size, H-Size, Zoom, Picture Size, or Aspect Ratio in your monitor's menu to adjust how wide the image appears.
  • If your monitor has no physical buttons, check whether it connects via USB or DisplayPort — some newer models control width through software instead.
  • After adjusting width, check that text is sharp and edges are not cut off; if the image still looks wrong, your computer's resolution or scaling may need adjustment too.

Finding your monitor's menu button

Every monitor has physical buttons somewhere on its body. On most modern flat-screen monitors, these are on the bottom bezel (the frame below the screen) or along the back panel. Look for a button labeled Menu, or one with a gear or three-line icon. Some older monitors have buttons on the side.

Press and hold the Menu button for one to two seconds. An on-screen menu should appear in the center or corner of your display — usually a white or gray box with text options. If nothing happens, try the button next to it. Monitors vary widely in which button opens the menu.

If your monitor has no visible buttons at all, it may be a newer model that uses software control. Check whether a cable runs from your monitor to your computer besides the video cable — USB or DisplayPort cables sometimes carry menu commands. If so, your monitor's software may be installed on your computer already, or you may need to read it from the manufacturer's website.

Navigating to the width or size setting

Once the menu is open, use the arrow buttons (usually next to or below the Menu button) to scroll through the options. Look for a setting with one of these names: Horizontal Size, H-Size, Width, Zoom, Picture Size, Aspect Ratio, or Overscan. The exact name depends on your monitor brand and model.

Highlight the setting you find and press the button that confirms your choice (often labeled Select, OK, or Enter). A slider or number field should appear. Use the arrow buttons to move the slider left (to shrink the image) or right (to expand it). Watch your screen as you adjust — you should see the image get narrower or wider in real time.

If you see an Overscan setting instead, this does the same thing: turning overscan off shrinks the image slightly inward from the edges, and turning it on expands the image to fill more of the screen. This is common on TVs and some older monitors.

Making the adjustment and checking your work

Adjust the width until the image fills the screen edge to edge without black bars on the sides, and without text or windows being cut off at the edges. The sweet spot is when you can see the full Windows taskbar or macOS menu bar at the bottom or top without any part disappearing off-screen.

Once you're happy with the width, press the button to confirm or exit the menu (usually Select, OK, or the Menu button again). The on-screen menu will close and your new setting will stay in place. Most monitors remember this setting even after you turn them off and back on.

If the image still looks wrong after adjusting width — if text is blurry, if colors look off, or if the image is still stretched — the problem may be your computer's resolution or scaling instead. Check your display settings in Windows (right-click the desktop and select Display Settings) or macOS (System Settings > Displays) to make sure your resolution matches your monitor's native resolution.

Fixing common width adjustment problems

If you adjusted the width but black bars are still visible on the sides, your computer may be sending a signal that's smaller than your monitor's native resolution. This is common when using older video cables (VGA or DVI) or when your graphics card doesn't support your monitor's full resolution. Try updating your graphics drivers or switching to a newer cable type like HDMI or DisplayPort if your monitor supports it.

If the image is now too small and you can see the monitor's bezel all around it, you may have adjusted width too far inward. Go back into the monitor menu and increase the width setting until the image fills the screen again.

If the width adjustment buttons don't seem to do anything, make sure you're in the right menu. Some monitors have separate menus for different settings — you may need to navigate to an Image, Picture, or Display submenu first. Check your monitor's manual (search the model number plus "manual" online) to find the exact path to the width setting.

When to use software control instead

Some newer monitors, especially gaming or professional models, control width through software on your computer rather than physical buttons. If your monitor came with a CD or you found software on the manufacturer's website, install it and open the program. Look for a setting called Display Size, Zoom, or Picture Adjustment. The software will let you change width the same way — by moving a slider until the image looks right.

If you're using a USB-C or Thunderbolt monitor, width control may be built into your computer's display settings instead. In Windows, go to Settings > System > Display and look for an Advanced Display option. In macOS, go to System Settings > Displays and check for a Resolution or Scaled option. Some of these settings control width indirectly by changing how your computer scales the image.

Frequently Asked Questions

Will adjusting screen width damage my monitor?

No. Width adjustment only changes how the monitor displays the signal your computer sends — it doesn't change any hardware inside. You can adjust it as many times as you want without risk. If you make a mistake, you can always adjust it back.

Why do I have black bars on the sides even after adjusting width?

Black bars usually mean your computer is sending a signal smaller than your monitor's native resolution. Check your display settings in Windows or macOS and make sure the resolution is set to the monitor's recommended size (often listed as 1920x1080, 2560x1440, or similar). If the resolution is already correct, try updating your graphics drivers.

My monitor has no menu button — how do I adjust width?

Check for a USB or DisplayPort cable running from your monitor to your computer. If one exists, the monitor likely uses software control. Visit the manufacturer's website, search for your monitor model, and read the control software. Install it on your computer and look for width or zoom settings inside the program.

Does adjusting screen width change my resolution?

No. Width adjustment and resolution are separate. Resolution is how many pixels your computer sends (set in Windows or macOS). Width is how your monitor stretches that signal across its screen (set in the monitor's menu). You may need to adjust both to get the image looking right.

What if I can't find the width setting in my monitor's menu?

The setting may be named something different on your monitor. Check your manual by searching online for your monitor's model number plus "manual" or "user guide." Look for sections titled Image, Picture, Display, or Size. If you still can't find it, contact the monitor manufacturer's support — they can tell you the exact menu path for your model.